Business Acquisitions and Divestitures - Identified Assets Acquired and Liabilities Assumed (SCRI Oncology, LLC) (Details) - USD ($) $ in Millions	Oct. 31, 2022	Jun. 30, 2023	Mar. 31, 2023
Business Acquisition, Contingent Consideration [Line Items]
Goodwill		$ 9,971	$ 9,947
U.S. Pharmaceutical
Business Acquisition, Contingent Consideration [Line Items]
Goodwill		$ 4,045	$ 4,050
SCRI Oncology, LLC | U.S. Pharmaceutical
Business Acquisition, Contingent Consideration [Line Items]
Cash	$ 166
Contribution of USOR	40
Total purchase consideration	206
Receivables	224
Property, plant, and equipment	22
Operating lease right-of-use assets	31
Intangible assets	177
Current liabilities	(42)
Long-term operating lease liabilities	(29)
Other non-current liabilities	(43)
Total identifiable net assets	340
Noncontrolling interest	(222)
Additional paid-in capital	(25)
Goodwill	113
Net assets acquired	$ 206